Radha Jagadeesan Alan Jeffrey Corin Pitcher James Riely Lambda-RBAC: Programming with Role-Based Access Control. 2008 4 Logical Methods in Computer Science 1 http://dx.doi.org/10.2168/LMCS-4(1:2)2008 db/journals/lmcs/lmcs4.html#JagadeesanJPR08